15.34% is the change from 339 to 391
Calculation steps:
[( 391 - 339 ) ÷ 339] x 100 = 15.34%
Formula
Percentage change = [(391 - 339) / 339] x 100
Subtract the new number by the original number
391 - 339 = 52
52 ÷ 339 = 0.15339233038348082
0.15339233038348082 x 100 = 15.34%